Carrier route record

OOPHX→SBP

SkyWest Airlines · Phoenix to San Luis Obispo

Flights: 417
Period: July 2025 to June 2026
Share of route: 34%
Carriers: 3

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.

SkyWest on PHX to SBP lands a B+, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 417 flights, with a median arrival 5 minutes early.

The US average over the same twelve months is 77.6%, so there is little to separate SkyWest on PHX to SBP from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

78.5%

Arrivals under 15 minutes late, of 409 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

0.96%

National rate is 1.81%

Whole route

83.1%

Every carrier on PHX to SBP, 1,231 flights

These figures cover 417 flights between July 2025 and June 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Carrier by carrier

SkyWest against every carrier on PHX to SBP

SkyWest flew 417 of the 1,231 flights on PHX to SBP, about 34% of it. Its 78.5% on time is 5 points worse than the route as a whole, which runs 83.1%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Envoy at 93.1% to SkyWest at 78.5%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on PHX to SBP
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Airthin sample	281	93.1%	41 min	1.07%	A
American Airlines	533	81.4%	81 min	0.56%	B+
SkyWest Airlines (this page)	417	78.5%	63 min	0.96%	B+

Departure window

When SkyWest runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 17 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am—
8am–11am75 flights88.0%
11am–2pm2 flights—
2pm–5pm196 flights80.4%
5pm–8pm81 flights70.9%
8pm–5am63 flights71.2%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

Book the morning departure. Flights leaving between 8am–11am arrive on time 88.0% of the time, against 70.9% for the evening window. That is 17 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 196 flights scheduled in it.

Across the year

SkyWest on PHX to SBP through the year

Jul–Sep 2025112 flights83.6%
Oct–Dec 202566 flights73.8%
Jan–Mar 2026106 flights67.3%
Apr–Jun 2026133 flights85.0%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 78.5% on time across 417 flights.

SkyWest on PHX to SBP did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.0% on time and its weakest Jan–Mar 2026 at 67.3%, a swing of 18 points on roughly 104 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Across the week, Tuesday is the strongest day at 91.1% on time and Sunday the weakest at 71.6%. 20 points is a smaller lever than departure hour, but it is free.

Delay causes

Why SkyWest runs late on this route

One category carries most of the weight here. Carrier accounts for 71% of the 5,520 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
71%
Late-arriving aircraft
23%
National Airspace System
4%
Extreme weather
2%

The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,938 of the 5,520 delay minutes reported here. The split is drawn from 5,520 reported delay minutes.

Cancellations sit at 0.96% against a national 1.81%, which is ordinary. Diversions add another 0.96%.

Connections and stage length

What a delay here costs

7.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The 509 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg runs 80.1% on time across 417 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 417 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking SkyWest on PHX to SBP

Put together: treat all of this as provisional. 417 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 78.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 409 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures